<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			* {
				margin: 0;
				padding: 0;
			}

			.tudou {
				position: relative;
				width: 444px;
				height: 320px;
				margin: 20px auto;
				background-color: hotpink;
			}
			.tudou img {
				width: 100%;
				height: 100%;
			}
			.tudou .mask {
				display: none;
				position: absolute;
				left: 0;
				top: 0;
				width: 444px;
				height: 320px;
				background: rgba(0,0,0,0.3) url(../images/arr.png) no-repeat  center;
			}
			.tudou:hover .mask {
				display: block;
			}
			
		</style>
	</head>
	<body>
		<div class="tudou">
			<img src="../images/tudou.jpg" alt="">
			<div class="mask"></div>
		</div>
	</body>
</html>
